Tithonia diversifolia
Proc. Amer. Acad. Arts 19: 5. 1883.
Perennials, subshrubs, or shrubs, to 250 (–500) cm. Leaves: petioles 2–6 cm; blades ± deltate to pentagonal, 7–33 × 7–22 cm, sometimes 3-lobed or 5-lobed, abaxial faces glabrous to hispid-pilose. Peduncles 7–24 cm. Phyllaries 16–28 in (3–) 4 series, oblong to ovate; outer 6–10 × 4–7 mm, apices rounded to acute, abaxial faces usually glabrous; inner 10–20 × 3–10 mm, apices rounded to acute, abaxial faces glabrous. Paleae 10–13 × 2–3 mm, mucros 1.5–2.5 mm. Ray-florets 7–14; corollas yellow, laminae linear, 48–69 × 9–16 mm. Disc-florets 80–120+. Cypselae 4–6 mm. 2n = 34.
Phenology: Flowering Sep–Jan.
Habitat: Disturbed sites
Elevation: 0–20+ m
Distribution
Introduced; Fla., Tex., Mexico, also in West Indies, Central America, Asia, Africa, Atlantic Islands, Indian Ocean Islands, Pacific Islands, Australia
Discussion
Tithonia diversifolia is widely cultivated in warm climates and may persist after plantings; a report for Louisiana was not confirmed for this treatment.
Selected References
None.